Mobile Terminal and Method of Controlling Content Thereof

1. A method for controlling a mobile terminal, the method comprising: displaying content on a front display unit of the mobile terminal; sensing a touch gesture applied to a distance detecting sensor on a rear input unit of the mobile terminal, the distance detecting sensor being activated when the touch gesture is sensed; measuring, via a controller of the mobile terminal, a spaced distance of a finger, taken away from the distance detecting sensor after inputting the touch gesture; and controlling, via the controller, an operation of the content displayed on the front display unit based on a combination type of the sensed touch gesture and the measured spaced distance, wherein the controlling the operation of the content comprises: capturing the currently-displayed content and outputting the captured content when the combination type is a type in which the distance detecting sensor senses a Knockon & Touch down on the rear input unit; extending a capture area by scrolling a captured screen when the combination type is a type in which the finger is spaced from the distance detecting sensor and held; increasing a scroll speed according to a spaced distance when the combination type is a type in which the finger is farther spaced in the held state; and saving the captured screen when the combination type is a type in which the distance detecting sensor is retouched during scrolling the captured screen.

2. The method of claim 1 , wherein the distance detecting sensor is a laser detection auto focus sensor provided at a center of the rear input unit located on an upper end portion of the rear side of the mobile terminal.

3. The method of claim 1 , wherein the touch gesture is a knockon input tapping a screen of the rear input unit at least one time.

4. The method of claim 1 , wherein the controlling the operation of the content comprises: capturing the content and automatically saving the captured content when the distance detecting sensor senses a Knockon & Touch down push on the rear input unit.

5. The method of claim 1 , further comprising: activating a capture all function capturing the full content when the combination type is a type in which the distance detecting sensor senses a Knockon & Touch up on the rear input unit.

6. The method of claim 1 , wherein the controlling the operation of the content comprises: sensing a selection of a target to be enlarged while the distance detecting sensor is touched; and controlling enlargement or reduction of the content in proportion to the spaced distance of the finger from the distance detecting sensor.

7. The method of claim 1 , wherein the controlling the operation of the content comprises: determining a set type of a lock screen when the distance detecting sensor senses Power up in a touched state; and providing individual or hierarchical lock screens according to the determined type of the lock screen and the spaced distance between the distance detecting sensor and the finger.

8. The method of claim 7 , wherein the providing the individual or hierarchical lock screens comprises: individually outputting different lock screens according to the spaced distance between the distance detecting sensor and the finger when the determined type of the lock screen is a first type; and sequentially outputting a combination of the different lock screens according to the spaced distance between the distance detecting sensor and the finger when the determined type of the lock screen is a second type.

9. The method of claim 8 , wherein the different lock screens comprise: a first lock screen for an input of a Knockon; a second lock screen for an input of a touch pattern; and a third lock screen for an input of a password.

10. A mobile terminal comprising: a front display unit configured to display content; a distance detecting sensor on a rear input unit and configured to sense a touch gesture, the distance detecting sensor being activated when the touch gesture is sensed; and a controller configured to: measure a spaced distance of a finger which is taken away from the distance detecting sensor after inputting the touch gesture to the distance detecting sensor, and control an operation of the content displayed on the front display unit based on a combination type of the touch gesture and the measured spaced distance, wherein the controller is further configured to: capture the currently-output content and output the captured content when the combination type is a type in which the distance detecting sensor senses a Knockon & Touch down on the rear input unit, scroll a captured screen to extend a capture area when the combination type is a type in which the finger is spaced from the distance detecting sensor and held, increase a scroll speed according to a spaced distance when the combination type is a type in which the finger is farther spaced apart from the distance detecting sensor, and save the captured screen when the combination type is a type in which the distance detecting sensor is retouched during scrolling of the captured screen.

11. The terminal of claim 10 , wherein the distance detecting sensor is a laser detection auto focus (LDAF) sensor provided at a center of the rear input unit located on an upper end portion of the rear side of the mobile terminal, and wherein the distance detecting sensor is provided in a central recess of the rear input unit, and activated in response to an input of the touch gesture.

12. The terminal of claim 10 , wherein the touch gesture is a Knockon input tapping a screen on the rear input unit at least one time.

13. The terminal of claim 10 , wherein the controller is further configured to capture the content and automatically save the captured content when the distance detecting sensor senses a Knockon & Touch down push.

14. The terminal of claim 10 , wherein the controller is further configured to activate a capture all function capturing the full content when the combination type is a type in which the distance detecting sensor senses a Knockon & Touch up on the rear input unit.

15. The terminal of claim 10 , wherein the controller is further configured to: sense a selection of a target to be enlarged while the distance detecting sensor is touched, and control enlargement or reduction of the content in proportion to the spaced distance of the finger from the distance detecting sensor.

16. The terminal of claim 10 , wherein the controller is further configured to: determine a set type of a user-set lock screen when the distance detecting sensor senses Power up in a touched state, and provide individual or hierarchical lock screens according to the determined type of the lock screen and the spaced distance between the distance detecting sensor and the finger.

17. The terminal of claim 16 , wherein the controller is further configured to: individually output different lock screens according to the spaced distance between the distance detecting sensor and the finger when the determined type of the lock screen is a first type, and sequentially output a combination of the different lock screens according to the spaced distance between the distance detecting sensor and the finger when the determined type of the lock screen is a second type.

18. The terminal of claim 17 , wherein the different lock screens comprise: a first lock screen for an input of a Knockon; a second lock screen for an input of a touch pattern; and a third lock screen for an input of a password.